US2524792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for solubilizing allyl starch
Assignee: Individual
•
Filing: 1947-07-11
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Granted: 1950-10-10
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Expires: 1967-07-11
Abstract
No abstract record available.
Inventors
- 👤 Robert M Hamilton
- 👤 Yanovsky Elias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
A PROCESS OF PREPARING ORGANICC SOLVENT SOLUBLE ALLYL STARCH COMPRISING: ALLYLATING STARCH BY HEATING STARCH WITH ALLYL CHLORIDE IN THE PRESENCE OF AQUEOUS ALKALI METAL HYDROXIDE, AN ORGANIC SOLVENT, AND A MINOR AMOUNT OF ALKALI METAL IODIDE; ACIDIFYING THE REACTION MIXTURE IN THE PH RANGE 2 TO 3, AND HEATING THE ACIDIFIED REACTION MIXTURE IN THE RANGE 70* TO 110*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |